text: Police verified that on the morning of May 13, the boys and girls of 3B class played and bit each other's hands?
classes:  No, the boys and girls of grade 3B went missing during recess on the morning of May 13.  Also, the boys and girls of grade 3B went missing during recess on the morning of May 13.  Yes, the boys and girls of grade 3B went missing during recess on the morning of May 13.